using 5-min and 8-min timers, how to measure 1 min?

[korean]

I really need help with this one; I can't seem to get my head around it. The question is:

Using a 5-minute and and 8-minute hourglass timer, how can you measure 1 minute?

Please help me figure this one out! Thank you!!

 

[stapel]

Hint: Can you find some multiple of 5 and some other multiple of 8 that are 1 apart?

Eliz.